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Old 05-05-2010, 10:45 PM   #1
UncleSpud
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Default Can you use a Cobb DP with stock exhaust and still go to Stage 2?

I have an '09 WRX with the stock exhaust and will be ordering a Cobb AP tomorrow. Two quick questions:

When I go to Stage 2, do I have to go with a full CBE or is installation of a Cobb DP (connected to the stock exhaust) enough to get me most of the benefits of Stage 2? Are there any CEL or fitment issues?

TIA for your help.
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Old 05-05-2010, 11:59 PM   #2
bwilliams373
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If you do a downpipe only instead of TBE you will not get the results you want. Simply put, the point is to get better flow. If you do not open up the full TBE you are defeating the purpose of the stage2 map. It makes adjustments for the larger diameter (3"). Will you see a difference? Probably. Will you see gains like others running stage2? Probably not. If you are trying to stay away from the noise, I would recommend the Perrin catback. I have it on my 08 hatch and it is not very loud and has no highway drone. The CBE is usually the easiest thing to find used if its a money thing.
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Old 05-06-2010, 12:52 AM   #3
UncleSpud
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Quote:
Originally Posted by bwilliams373 View Post
If you do a downpipe only instead of TBE you will not get the results you want. Simply put, the point is to get better flow. If you do not open up the full TBE you are defeating the purpose of the stage2 map. It makes adjustments for the larger diameter (3&quot. Will you see a difference? Probably. Will you see gains like others running stage2? Probably not. If you are trying to stay away from the noise, I would recommend the Perrin catback. I have it on my 08 hatch and it is not very loud and has no highway drone. The CBE is usually the easiest thing to find used if its a money thing.
Thanks--I appreciate the advice. Noise is definitely an issue. I'm more interested in acoustic serenity and stealth than I am in making a statement as a boy-racer. In the '09's, the biggest bump in TQ/HP is in Stage 1, not Stage 2, but I'd hate to marginalize Stage 2 gains by not letting the motor breathe well.
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Old 05-06-2010, 01:05 AM   #4
meccjoo
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dp is where most of the restriction is. that is why you dont gain much of anything when just installing a cbe.
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Old 05-06-2010, 03:11 PM   #5
Cobb Tuning
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We have seen that there is very little difference when running just the downpipe for stage 2, especially on the dual outlet exhaust cars like the Legacy or the WRX sedan. However, even on a single outlet exhaust, the power loss is somewhat minimal.

Installing a downpipe and running the stage 2 map will give you great gains AND allow you to stay "under the radar" as it were with a nice and quiet stock catback system. In fact, many of our customers are going this route and until you start trying to really push your car power wise, the results are impressive.

Travis
COBB Tuning
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Old 05-09-2010, 06:08 PM   #6
YoungGuna267
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i have been running stage 1 for a few weeks. i installed a catless DP last weekend, and decided to try the stage 2 out today since i saw the post above. The car runs and pulls great .it's nice to have a fast car without all the noise from an aftermarket CBE.
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Old 05-09-2010, 06:11 PM   #7
Snow Drift
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Quote:
Originally Posted by UncleSpud View Post
I have an '09 WRX with the stock exhaust and will be ordering a Cobb AP tomorrow. Two quick questions:

When I go to Stage 2, do I have to go with a full CBE or is installation of a Cobb DP (connected to the stock exhaust) enough to get me most of the benefits of Stage 2? Are there any CEL or fitment issues?

TIA for your help.
Thast is fine. Stage 2 is just a DP and tune. As long as the Cobb DP removes the stock MP cat then you are fine. You'll now have just 1 high flow cat in your exhaust.

The catback will add minimal horsepower, and basically none on a dyno. At least nothing to make the $200-800 price tag worth it.
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Old 05-09-2010, 07:21 PM   #8
UncleSpud
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Quote:
Originally Posted by YoungGuna267 View Post
i have been running stage 1 for a few weeks. i installed a catless DP last weekend, and decided to try the stage 2 out today since i saw the post above. The car runs and pulls great .it's nice to have a fast car without all the noise from an aftermarket CBE.
I just went to Stage 1 on Friday and I love it. On the basis of the more recent posts, I think I'll stick with the stock exhaust and just add the Cobb DP when I'm ready for Stage 2.

YoungGunna, could you tell much of a difference with Stage 2? (with the '09's, most of the gains seem to be with Stage 1)
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Old 05-09-2010, 07:39 PM   #9
Snow Drift
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Quote:
Originally Posted by UncleSpud View Post
YoungGunna, could you tell much of a difference with Stage 2? (with the '09's, most of the gains seem to be with Stage 1)
The power is in Stage 2. Stage 1 is great, but Stage 2 is even better.

Stock vs Stage 1 vs Stage 2
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Old 05-09-2010, 09:50 PM   #10
YoungGuna267
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Quote:
Originally Posted by UncleSpud View Post
I just went to Stage 1 on Friday and I love it. On the basis of the more recent posts, I think I'll stick with the stock exhaust and just add the Cobb DP when I'm ready for Stage 2.

YoungGunna, could you tell much of a difference with Stage 2? (with the '09's, most of the gains seem to be with Stage 1)

I could tell a difference from using the stage1 and then going to the stage 2, the car did pull harder, the only problem it was with my butt dyno.
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Old 05-08-2011, 03:14 AM   #11
jojotherider
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bumping an old thread...

uncle spud did you ever pickup a DP and use it with the stock cbe?

i'm considering doing the same with mine (i've got full TBE and a mad headache from the blitz nurspec)
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Old 05-08-2011, 10:03 AM   #12
scubylimited
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If you look strictly at the horsepower and torque increases between stage 1 and 2, the increases aren't as impressive as stage 1 gains from stock, but you have to realize you spool faster and the power and torque come earlier, which makes a big difference in actuality. I went stage 1 with aem and 93 octane and I decided to go with a downpipe and stage 2 map soon to retain my stock exhaust. (2011 sedan exhaust is loud anyways, it's so deep and rumbly, and it's gotten loud lately [just broke 3500 miles])
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Old 07-01-2011, 02:01 PM   #13
kakarotoni
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Bump an old thread,

I'm thinking of running a shorty Stromung DP and a gutted up pipe on my 02 WRX wagon. And just keep the stock exhaust with the mid pipe cat on. Would I have any problems?
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Old 07-02-2011, 10:57 AM   #14
cjnlstntxs
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Glad I found this tread. I am ordering a Cobb AP and DP for my wife's 09 FXT. She did not want it loud at all so I am going to keep the Stock CBE, assuming the Cobb DP plays nice with (or should i say hooks up to) the stock cbe. gotta do somthing to fight that damned 4eat tranny in her FXT lmao.
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Old 10-07-2013, 03:35 PM   #15
RobScooby
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Likewise, glad I found this thread too. I have a 2012 STi sedan + SF intake, running Cobb AP Stage1 ACN v332 beta (run V-power all the time). Just purchased the Cobb DP, couldn't get here quicker...

...not too sure about the differences of the models, will I be OK to run the DP on stage2 ACN with a standard CBE folks?

Apologies for potentially breaking the forum rules, n00b here.
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Old 10-07-2013, 06:09 PM   #16
Chicago AJ
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Quote:
Originally Posted by RobScooby View Post
Likewise, glad I found this thread too. I have a 2012 STi sedan + SF intake, running Cobb AP Stage1 ACN v332 beta (run V-power all the time). Just purchased the Cobb DP, couldn't get here quicker...

...not too sure about the differences of the models, will I be OK to run the DP on stage2 ACN with a standard CBE folks?

Apologies for potentially breaking the forum rules, n00b here.
You should be perfectly fine.
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